<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>容器标签</title>
</head>
<body>
  <div>这是一个div</div>
  <div>这是第二个div</div>
  <span>这是第一个span</span>
  <span>这是第二个span</span>
  <pre>
    int main() {
      printf("%d",2);
    }
  </pre>
</body>
</html>